深部岩体分区破裂化现象数值模拟  

NUMERICAL SIMULATION OF ZONAL DISINTEGRATION FOR DEEP ROCK MASS

作　　者：李树忱[1] 冯现大[1] 李术才[1] 袁超[1] 李文婷[1] 孙倩[1] 

机构地区：[1]山东大学土建与水利学院,山东济南250061

出　　处：《岩石力学与工程学报》2011年第7期1337-1344,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB732002);山东省自然科学基金资助项目(2009ZRB02285);山东大学2010年自主创新基金自然科学类专项自由探索项目(2010TS038)

摘　　要：利用数值手段模拟深部岩体分区破裂现象的产生及演化过程。从岩石的细观结构层次出发,基于最大拉应力准则和应变能密度理论建立单元破坏准则,并应用弹性损伤力学方法来模拟岩石的破坏行为,数值模拟过程中,必须考虑地下洞室开挖释放的能量足够引起围岩产生动力现象,即将开挖过程视为一个动力过程。基于上述思想,通过FLAC3D中的FISH语言开发分区破裂化现象的计算程序,并应用该程序求解某深埋巷道围岩破裂形态,得到破裂区和非破裂区的宽度和数量,数值模拟结果与现场观测成果有很好的一致性。The generation and evolution of zonal disintegration are analyzed by means of numerical simulation.Based on maximum tensile stress criterion and strain energy density theory,the element failure criteria have been developed in terms of mesoscopic level.Then the elastic damage mechanics is considered to simulate the failure behavior of rock.In the specific numerical modeling process,the released energy caused by the excavation of underground workings must be large enough to bring about dynamic phenomenon of the surrounding rock.In other words,the excavation process can be considered as dynamic process.Based on the above concepts,the zonal disintegration code has been developed by the FISH of FLAC3D.Then it was used to determine the failure pattern of the rock mass around the deep roadways and the quantity and width of the zonal disintegration also have been obtained.The results of numerical simulation are in good agreement with the in-situ monitoring results.

关 键 词：岩石力学 深部岩体工程 分区破裂化现象 弹性损伤 动力问题 

分 类 号：TU45[建筑科学—岩土工程]